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Mathematical Problems in Engineering
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Mathematical Problems in Engineering
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2016
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Article
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Tab 3
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Research Article
Reliability Evaluation of NC Machine Tools considering Working Conditions
Table 3
Computation by the partial likelihood estimation method and the likelihood ratio test.
Step
Working conditions covariates
1
4
1.285
0.040
−0.065
0.1340
7.871
9.488
2
3
1.226
0.040
0.1410
7.809
7.815
3
2
1.142
0.049
6.552
5.991